This Ctrl icon is a responsive icon. This means that it's optimized for four resolutions, from tiny 16x16 until highly detailed 80x80. The style comes from the latest Microsoft Office, which makes it perfect for any Windows applications, in particular, those with ribbon toolbar control. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 15,500 icons, all in the same style and quality.
This icon for control is a rectangle with sides that are nearly equal in length. The width is a bit larger than the height. The corners are rounded, and at its center are there letters ctrl, with the C being capitalized.